Driving mechanism for grinding-tools



C W HEBERGER DRIVING MECHANISM FOR GRINDING TOOLS.

APPLICATION FILED APR- 3. I919.

Patented Sept. 28, 1920.

(Conny UNITED STATES CHARLES W. IIEBERGER, OF ROCHESTER, NEW YORK.

DRIVING MECHANISM FOR GRINDING-TOOLS.

Specification of Letters Patent.

Patented Sept. 28, 1920.

Application filed April 3, 1918. Serial No. 287.271.

To whom it may concern.

Be t known that I, CHARLES IV. HnnnRenR, a citizen of the United States, residing at Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Driving Mechanism for GrindingTools, of which the following is a specification.

The object of this invention is to provide anew and improved form of grinding tool for reseating valves. 2

This and other objects of this invention will be fully illustrated in the drawing, described in the specification and pointed out in the claim at the end thereof.

In the accompanying drawing, Figure 1 is a side elevation of the grinding tool.

Fig. 2 is an end elevation of the grinding tool.

Fig. 3 is a plan view of one of the bevel pinions which intermittently rotate the spindle of the grinding tool.

In the several figures of-the drawing, like reference numerals indicatelike parts.

The grinding tool shown in the drawing operates to oscillate a valve in opposite directions on its seat and progressively advances the valve periodically in one direction. This movement given to the valve by the grinding tool insures an even grinding and accurate seating of the valve.

As shown in the drawing, the grinding tool comprises a frame 1 having a spindle 2 mounted to rotate therein longitudinally thereof. Two openings 3 and 4 are provided in the-frame 1 in which the bevel pinions 5 and 6, respectively, rotate, being mounted on the spindle 2 and rotating therewith. Centrally mounted to rotate between the bevel pinions '5 and 6 is the mutilated bevel gear 7, the teeth of which are adapted to mesh with the teeth on the pinions 5 and 6. The bevel gear 7 is mounted to rotate on the stud 8 provided in the frame 1. A crank 9 having a handle 10 is fastened to the back of the bevel gear 7, through which crank the gear is rotated. The frame 1 has a stationary handle 11 provided at the top by means of which the tool is held in an upright position and through which a slight downward pressure may be exerted on the valve by the operator while the valve is oscillated by the spindle 2 on the rotation of the crank 9.

The bevel gear 7 is mutilated and only a segment thereof is provided with teeth. The

of the spindle 2.

length of this segment is such that when the teeth on one end of the segment engage the teeth of one of the pinions 5 or 6 the teeth on the other end of the segment disengage from the teeth of the other pinion. In this way the mutilated gear 7 will mesh with but one of the pinions 5 or 6 at a time and when it meshes with the pinion 6 it will rotate the spindle 2 in one direction, while when it meshes with the pinion 5 it will rotate the spindle in the reverse direction. This gives the spindle an oscillatory motion which is transmitted to the valve to be ground thereby through the bit 12 provided on the lower end In order to give the valve a progressive motion the spindle 2 must be given a greater angular turn in one direction than in the reverse direction. This is accomplished by the mutilated pinion 5. This pinion is divided into four sections of which every alternate section is provided with teeth. It thus has two sections with five teeth each and two sections without teeth, the spacer in such sections equaling the angle occupied by two teeth. When the teeth on the mutilated gear mesh with the teeth of the mutilated pinion 5 it will rotate the pinion only a fraction of the rotation given to the pinion 6, which pinion is not mutilated and whenever the mutilated gear 7 meshes with the pinion 6 it will give it a turn in one direction equal to the ratio of the number of teeth on the gear to the number of teeth of the pinion 6. WVhen the'gear meshes with the teeth on the pinion 5 it will give the spindle but a fraction of a turn which in ratio is equal to the number of teeth on one segment of the pinion 5 to that of the number of teeth in the pinion 6.

In practice, I provide the bevel gear 7 with twelve teeth and the bevel pinion 6 with fourteen teeth and the bevel pinion 5 with but five teeth in each segment, the intermediate blank spaces each occupying an angle equal to the angle or space occupied by two teeth when the gear 7 is rotated. The spindle 2 will first be turned 12 teeth in one direction when the teeth on the gear 7 mesh with the teeth of the pinion 6, after which the spindle will stop turning, and when the gear 7 meshes with the pinion 5 the spindle will be turned five teeth in the reverse direction, after which it will be again advanced 12 teeth and turned back five teeth, this cycle repeating itself for each rotation of the gear 7, the spindle being moved 17 teeth and making a net advance of 7 teeth or one-half turn for each cycle. v V V In this way the movable valve seat of the valve is oscillated on the stationary valve seat so that at each complete turn of the mutiliated gear the valve is given a turn of a greater angle in one direction and a correspondingly smaller turn' in the opposite direction. i

The ratio at which the spindle is to turn first in one direction and then in the other, of course, may be varied by providing each of the pinions and the gear With a number of teeth, Which form a ratio to one another equal to the angular turn desired for each pinion 0n the complete revolution of the crank 9. I

I Claim: r 1

In a grinding tool for Valves, the combinationflof a frame, aspindle mounted to rotate in said frame, a mutilated bevel gear mountedto rotate on one side of said frame, a mutilated pinion having alternate segmentsof teeth'and blank spaces mounted on said spindle on one side of said mutilated gear, and ,a second bevel pinion mounted on said spindle on the other side of said bevel gear.

I In testimony whereof I aflix my signature. 30

CHARLES"W.'HEBERGER. 

